sunxi: gpio: Add support for gpio pins on the AXP209 pmic

Some boards use GPIO-s on the pmic, one example of this is the A13-OLinuXino
board, which uses gpio0 of the axp209 for the lcd-power signal.

This commit adds support for gpio pins on the AXP209 pmic, the sunxi_gpio.c
changes are universal, adding gpio support for the other AXP pmics (when
necessary) should be a matter of adding the necessary axp_gpio_foo functions
to their resp. drivers, and add "#define AXP_GPIO" to their header file.

Note this commit only adds support for the non device-model version of the
gpio code, patches for adding support to the device-model version are very
welcome.

The string representation for these gpio-s is AXP0-#, the 0 in the AXP0 prefix
is there in case we need to support gpio-s on more then 1 pmic in the future.
At least A80 boards have 2 pmics, and we may end up needing to support gpio-s
on both.

Signed-off-by: Hans de Goede <hdegoede@redhat.com>
Acked-by: Ian Campbell <ijc@hellion.org.uk>

1 files changed, 7 insertions, 0 deletions

diff --git a/include/axp209.h b/include/axp209.h
index 21efce64bb..043624953a 100644
--- a/include/axp209.h
+++ b/include/axp209.h
@@ -4,6 +4,8 @@
  * SPDX-License-Identifier:	GPL-2.0+
  */
 
+#define AXP_GPIO
+
 extern int axp209_set_dcdc2(int mvolt);
 extern int axp209_set_dcdc3(int mvolt);
 extern int axp209_set_ldo2(int mvolt);
@@ -12,3 +14,8 @@ extern int axp209_set_ldo4(int mvolt);
 extern int axp209_init(void);
 extern int axp209_poweron_by_dc(void);
 extern int axp209_power_button(void);
+
+extern int axp_gpio_direction_input(unsigned int pin);
+extern int axp_gpio_direction_output(unsigned int pin, unsigned int val);
+extern int axp_gpio_get_value(unsigned int pin);
+extern int axp_gpio_set_value(unsigned int pin, unsigned int val);